JP2002283194A - Centerless grinding method and its grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the grinding workability of a work having circular arc- shaped grinding surfaces and unground surfaces on its outer periphery. SOLUTION: The work 111 has the circular arc-shaped grinding surfaces 114 and the unground surfaces 113. A blade 3 is provided with a recessed curved surface 11 larger than the curvature of the circular arc-shaped grinding surface 114. The work 111 is rotated by slidingly supporting the circular arc-shaped grinding surfaces 114 by the recessed curved surface 11 in a noncontact position of the work 111 with a grinding wheel 1 and a regulating wheel 2. In the noncontact position of the work 111 with the grinding wheel 1 and the regulating wheel 2, the work 111 rotates by an inertia force by slidingly supporting the circular arc-shaped grinding surfaces 114 by the recessed curved surface 11 of the blade 3, and rotates again in a position of being supported in contact by the grinding wheel 1 and the regulating wheel 2 to thereby grind the circular arc-shaped grinding surfaces 114 of the work 111 having the unground surfaces 113.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a centerless grinding method for centerless grinding a work having a non-ground surface, and a grinding machine therefor.

[0002]

The centerless grinding machine is
This is a grinding machine that grinds a work without gripping it with a chuck or a center. As shown in FIGS. 6 and 7, a work 101 is sandwiched between a grinding wheel 1 and an adjustment wheel 2, and The outer surface of the work 101 is ground while the lower side is supported by the blade 3 as a support. The work 101 is fed between the grinding wheel 1 and the adjustment wheel 2 from the entrance 4 at one end thereof as shown by an arrow A in FIG.
It is discharged from the outlet 5 at the other end. The axial directions of the grinding wheel 1 and the adjusting wheel 2 are adjusted so as to gradually become narrower from the inlet portion 4 side to the outlet portion 5 side, and the work 101 is fed between the grinding wheel 1 and the adjusting wheel 2 by rotation thereof. As the work is performed, the outer peripheral surface, which is the ground surface of the work 101, gradually advances, and the final size of the work 101 is determined at the outlet 5. In the case of a flat work 101 as shown in the figure, as shown in FIG. 7, a plurality of works 101, 101... Are fed between the grinding wheel 1 and the adjustment wheel 2 in a state of being coaxially adjacent and arranged. Thus, the support surface 6 of the blade 3 for supporting the fed work 101 is formed on an inclined surface on which the grinding wheel 1 side is higher.

[0003] By the way, some of the workpieces to be ground using the above-mentioned centerless grinding machine have a non-ground surface in which a part of the outer circumference is unnecessary or cannot be ground, in addition to the one in which the entire outer peripheral surface is ground. For example, the substantially oval-shaped workpiece 111 shown in FIGS. 8 and 9 has flat non-ground surfaces 113, 113 in which a part of a virtual outer circumferential circle 112 is cut out.
The two sides sandwiching 13 are arc-shaped ground surfaces 114, 114, and these arc-shaped ground surfaces 114, 114 need to be ground in order to finish them to a predetermined roundness in accordance with the virtual outer circumference circle 112. Also,
The illustrated work 111 has a flat shape in which the radius of an imaginary peripheral circle 112 centered on the center position S is r, and the thickness T is thinner than the diameter φ (2 × r), and is shown in the front view of FIG. It is symmetrical.

[0004] In the work 111 having a shape in which a part of the outer circumferential circle is notched as described above, the centerless grinding cannot be performed using the blade 3 having the inclined support surface 6. . For this reason, as shown in FIG. 10, the plurality of works 111, 111... Are laminated using an adhesive or the like so that the directions intersect at the front and back, and the outer periphery of the plurality of works 111, 111. By making the shape circular, centerless grinding can be performed in the same manner as a cylindrical workpiece, and after grinding, the workpiece 111 can be obtained by individually separating and grinding the arc-shaped ground surfaces 114, 114 to a predetermined accuracy. it can.

However, as shown in FIG. 10, in order to perform centerless grinding, a plurality of works 111, 111... Are bonded before grinding, and the bonded works 111, 111. Since work is required, there is a problem that work efficiency is reduced. In addition, the work before grinding is not limited to simply changing the direction before and after bonding, but also the arc-shaped grinding surface of each work 111, 111 ...
114 must be correctly aligned with the imaginary outer circle 112, and after grinding, the individual workpieces
A complicated operation such as removal of the adhesive adhered to 111, 111... Is required.

Accordingly, the present invention is intended to solve such a problem, and when grinding a workpiece having an arcuate ground surface and a notched non-ground surface on the outer periphery, the conventional complicated work before and after grinding. An object of the present invention is to provide a centerless grinding method and a grinding machine capable of improving work efficiency without requiring a complicated work.

[0007]

According to a first aspect of the present invention, there is provided a centerless grinding method comprising: a grinding wheel provided rotatably; and a grinding wheel provided substantially parallel to the grinding wheel so as to be rotatable. Adjustment wheel, using a support that is provided between the grinding wheel and the adjustment wheel and supports a workpiece that moves while being ground between the grinding wheel and the adjustment wheel, and an arc-shaped grinding surface on the outer periphery. A centerless grinding method for grinding the arc-shaped grinding surface of the work having a non-grinding surface, wherein the support has a concave curved surface larger than the curvature of the arc-shaped grinding surface, and the work is a grinding wheel. A grinding method in which the arc-shaped grinding surface is slidably supported on the concave curved surface at a position not in contact with the adjustment wheel, and the workpiece rotates.

Accordingly, the workpiece is brought into contact with the grinding wheel and the adjusting wheel, and is rotated in the opposite direction to the grinding wheel and the adjusting wheel, so that the arc-shaped grinding surface in contact with the grinding wheel is ground. At the non-contact position with the car, the arc-shaped ground surface of the work is slidably supported on the concave curved surface of the support,
It rotates by inertia force and again rotates to a position supported and contacted by the grinding wheel and the adjusting wheel, whereby the arc-shaped ground surface of the work having a non-ground surface can be ground. In particular, since the concave curved surface is formed with a curvature larger than the curvature of the arc-shaped ground surface, a portion where the arc-shaped ground surface is in contact with the concave curved surface is in line contact, rotation with sliding is performed smoothly, and the circular shape is obtained. The arc-shaped ground surface can be satisfactorily ground.

A centerless grinding machine according to a second aspect of the present invention includes a grinding wheel rotatably provided, an adjustment wheel substantially parallel to the grinding wheel and rotatably provided, and a grinding wheel and the adjustment wheel. In a centerless grinding machine provided with a support which is provided between the grinding wheel and the adjusting wheel, and which supports a workpiece moving while being ground between the grinding wheel and the adjusting wheel, the workpiece has an arc-shaped ground surface and a non-ground surface on its outer periphery. The support surface of the support is formed as a concave curved surface larger than the curvature of the arc-shaped ground surface, and the width of the concave curved surface is set to 2 times the radius of the arc-shaped ground surface.
It was formed smaller than twice.

Therefore, the workpiece comes into contact with the grinding wheel and the adjusting wheel, and is rotated in the opposite direction to the grinding wheel and the adjusting wheel, while the arc-shaped grinding surface in contact with the grinding wheel is ground, and the workpiece is sandwiched between the grinding wheel and the adjusting wheel. In the non-contact position where the workpiece is not supported at two points, the arc-shaped ground surface is slidably supported by the concave curved surface of the support, the work rotates by inertia force, and is again supported by the grinding wheel and the adjustment wheel. The workpiece is rotated to a predetermined position, whereby the arc-shaped ground surface of the workpiece having the non-ground surface can be ground. In particular, since the concave curved surface is formed with a curvature larger than the curvature of the arc-shaped ground surface, a portion where the arc-shaped ground surface is in contact with the concave curved surface is in line contact, rotation with sliding is performed smoothly, and the circular shape is obtained. The arc-shaped ground surface can be satisfactorily ground.

According to a third aspect of the present invention, in the centerless grinding machine according to the second aspect of the present invention, the work has the non-ground surface at a position facing the flat surface and is flat. Therefore,
When the opposing non-grinding surface faces the grinding wheel and the adjusting wheel, the workpiece comes into non-contact with the grinding wheel and the adjusting wheel. In this state, the workpiece is rubbed by the arc-shaped grinding surface on the concave curved surface of the support. And can be smoothly rotated to a position where it is supported again by the grinding wheel and the adjusting wheel.

The invention of claim 4 is the invention of claim 2 or 3
In the centerless grinding machine according to the invention, the position of the bottom of the concave curved surface is set immediately below the center position of the workpiece in the grinding state. Therefore, the arc-shaped grinding surface slides to the bottom, and since this bottom is set immediately below the center position of the workpiece in the grinding state, the rotational center of the workpiece does not shift between the grinding wheel and the adjustment wheel, Smooth rotation can be continued.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the centerless grinding machine of the present invention will be described below with reference to FIGS. The basic structure of the centerless grinding machine and the work 111
Since the configuration itself is the same as that shown in FIGS. 8 to 10 described above, corresponding parts are denoted by the same reference numerals, and description thereof will be omitted. Different parts will be described in detail. First, to supplement the configuration of the work 111, the work 111 is a powder metallurgy, the raw material magnetic powder is compressed by a powder forming press to form a green compact, and the green compact is heated by a sintering furnace. A permanent magnet made of a sintered body or the like, with different magnetic poles on the front and back surfaces.

The blade 3 has a concave curved surface 11 larger than the curvature of the arc-shaped ground surface 114 of the workpiece 111, and the width W of the concave curved surface 11 is smaller than the diameter φ of the workpiece 111. In this example, the concave curved surface 11 has an entire width W formed in an arc surface having a radius R, and the radius R is formed to be slightly larger than the radius r. The width W is the width of the grinding wheel 1 and the adjusting wheel 2 in the direction intersecting the axis. Further, as shown in FIG. 3 and the like, the position of the bottom 12 of the concave curved surface 11 is
The grinding wheel 1 and the adjusting wheel 2 are sandwiched between the grinding wheel 1 and the adjusting wheel 2 and are set immediately below the center position S of the workpiece 111 in a grinding state where the arc-shaped grinding surfaces 114 and 114 contact the grinding wheel 1 and the adjusting wheel 2. The height position of the center position S of the work 111 in the state is the work center grinding height position H. The work center grinding height position H is above a line connecting the rotation centers of the grinding wheel 1 and the adjusting wheel 2. When the work 111 shown in FIG. 3 is sandwiched between the grinding wheel 1 and the adjustment wheel 2, a part of the outer periphery of the work 111 may be slidably supported by the concave curved surface 11. The bottom 12 is located at the lowest position of the concave curved surface 11. Further, as shown in FIG. 4, the center position S of the work 111 is directly above the bottom portion 12 and the center position S of the work 111 is in the state where the arc-shaped grinding surface 114 is in contact with the bottom portion 12. The height position of the bottom 12 is set so as to be H.

Next, the operation of grinding the work 111 by the centerless grinding machine having the blade 3 having the above-described configuration will be described. Work between the grinding wheel 1 and the adjusting wheel 2 from the entrance 4
As shown in FIG. 3, the workpiece 111 is rotated by the grinding wheel 1 and the adjustment wheel 2 which rotate in the same direction, and the workpiece 111 is rotated in a direction opposite to these directions to perform grinding. In this case, the work
111 may be sent one by one or may be sent side by side.
The rotation of the grinding wheel 1 and the adjusting wheel 2 causes each work 111, 111 ...
At the center position S. When the arc-shaped grinding surfaces 114, 114 shown in FIG. 3 are in contact with the grinding wheel 1 and the adjusting wheel 2, the workpiece 111 is rotated by being supported at two points in contact with the grinding wheel 1 and the adjusting wheel 2. When further rotated, FIG.
As shown in the figure, the non-grinding surfaces 113, 113
, And the arc-shaped grinding surfaces 114, 114 are the grinding wheel 1 and the adjusting wheel 2.
In this case, the workpiece 111 continues to rotate due to the inertial force, the lower arcuate grinding surface 114 contacts the concave curved surface 11, and the workpiece 1 contacts at one point of the contact point of the arcuate grinding surface 114.
As shown in FIG. 4, the arc-shaped ground surface 114 is in contact with the bottom 12, and at this position, the center position S of the work 111 is the work center grinding height position H, and the center position S is While holding the position almost directly above the bottom portion 12, furthermore, while the arc-shaped ground surface 114 slides on the concave curved surface 11 due to inertial force,
The arc-shaped grinding surface 114 is again brought into contact with the grinding wheel 1 and the adjusting wheel 2, and is again rotated by the grinding wheel 1 and the adjusting wheel 2, and the arc-shaped grinding surface 114 in contact with the grinding wheel 1 is ground. The arc-shaped ground surfaces 114, 114 are repeatedly ground to a desired roundness. In this case, in particular, the two-point contact between the grinding wheel 1 and the adjusting wheel 2 is released, and as shown in FIG. 4, the support surface of the blade 3 is Since the concave curved surface 11 is formed with a curvature larger than the curvature of the arc-shaped ground surface 114, the concave surface 11 comes into contact with the concave curved surface 11 at one point while sliding, and the center position S of the workpiece 111 is shifted. Is held just above the bottom 12 at the center of rotation, that is, the workpiece center grinding height H,
The smooth rotation can be obtained without causing any positional deviation of the wheel 111 and the adjusting wheel 2 with respect to the grinding wheel 1 and the adjusting wheel 2, and the grinding can be performed satisfactorily.
Further, since the curved surface 11 is formed to have a curvature larger than the curvature of the grinding surface 114, the grinding surface 114 comes into contact with the curved surface 11 in a line contact state in the feed direction. Rotation can be performed continuously.

As described above, in the present embodiment, the grinding wheel 1 provided rotatably and the grinding wheel 1 are provided.
Adjustment wheel 2 provided substantially rotatably and substantially parallel to the above, and grinding wheel 1
Between the grinding wheel 1 and the adjusting wheel 2
And a blade 3 serving as a support for supporting a workpiece 111 moving while being ground between the workpiece and the outer peripheral surface of the workpiece.
4 and the non-ground surface 113, the arc-shaped ground surface 1 of the workpiece 111
A centerless grinding method for grinding 14
Is provided with a concave curved surface 11 larger than the curvature of the arc-shaped grinding surface 114, and the workpiece 111 is in a non-contact position with the grinding wheel 1 and the adjusting wheel 2,
This is a grinding method in which the workpiece 111 rotates while the arc-shaped grinding surface 114 is slidably supported on the concave curved surface 11.
And the grinding wheel 114 which contacts the grinding wheel 1 while rotating in the opposite direction to the grinding wheel 1 and the grinding wheel 2 in contact with the grinding wheel 2.
Is ground, the workpiece 111 is not in contact with the grinding wheel 1 and the adjustment wheel 2, and the workpiece 111 is supported by the concave curved surface 11 of the blade 3 slidably supported by the arcuate ground surface 114, and rotated by inertia force. Then, the workpiece 111 is again rotated to a position where the grinding wheel 1 and the adjustment wheel 2 are in contact with and supported by each other, whereby the arc-shaped ground surface 114 of the workpiece 111 having the non-ground surface 113 can be ground. In particular, since the concave curved surface 11 is formed to have a curvature larger than the curvature of the arc-shaped ground surface 114, a portion where the arc-shaped ground surface 114 is in contact with the concave curved surface 11 is in line contact, and rotation with sliding is smoothly performed. Thus, the arc-shaped ground surface 114 can be satisfactorily ground.

In this embodiment, a grinding wheel 1 rotatably provided, an adjusting wheel 2 substantially parallel to the grinding wheel 1 and rotatably provided, and a grinding wheel In a centerless grinding machine provided with a blade 3 which is provided between the grinding wheel 1 and the adjusting wheel 2 and which supports a workpiece 111 which moves while being grinded between the grinding wheel 1 and the adjusting wheel 2, the workpiece 111 is Arc-shaped ground surface 114 and non-ground surface 113 on the outer circumference
And the support surface of the blade 3 is formed on the concave curved surface 11 larger than the curvature of the arc-shaped ground surface 114, and the width W of the concave curved surface 11 is smaller than twice the radius r of the arc-shaped ground surface 114. The workpiece 111 is in contact with the grinding wheel 1 and the adjusting wheel 2, and is rotated in a direction opposite to the rotation of the grinding wheel 1 and the adjusting wheel 2 and is in contact with the grinding wheel 1.
In the non-contact position where 114 is ground and the work 111 is not supported at two points between the grinding wheel 1 and the adjusting wheel 2, the blade 3
The arcuate grinding surface 114 is slidably supported on the concave curved surface 11 of the, and the work 111 rotates by inertial force, and again rotates to a position where it is supported by contact with the grinding wheel 1 and the adjustment wheel 2.
The arc-shaped ground surface 114 of the work 111 having the non-ground surface 113 can be ground. In particular, since the concave curved surface 11 is formed with a curvature larger than the curvature of the arc-shaped ground surface 114, a portion where the arc-shaped ground surface 114 is in contact with the concave curved surface 11 is in line contact, and the rotation accompanying sliding is smoothly performed. Done, arc-shaped grinding surface
114 grinding can be performed well.

According to a third aspect of the present invention, there is provided the centerless grinding machine according to the second aspect of the present invention, wherein
13, 113 are located at opposing positions and are flat. Therefore, when the opposed non-grinding surfaces 113 and 113 face the grinding wheel 1 and the adjusting wheel 2, the work 111 is not in contact with the grinding wheel 1 and the adjusting wheel 2. The arcuate grinding surface 114 is slidably supported on the curved surface 11 and can be smoothly rotated again to a position where it is supported by the grinding wheel 1 and the adjustment wheel 2 again.

Further, as described above, in the present embodiment, claim 4
In the centerless grinding machine according to the second or third aspect of the present invention, the position of the bottom portion 12 of the concave curved surface 11 is set immediately below the center position S of the workpiece 111 in the grinding state, Since the grinding surface 114 slides on the bottom portion 12 and the bottom portion 12 is set immediately below the center position S of the workpiece 11 in the grinding state, the rotation center S of the workpiece 11 is positioned between the grinding wheel 1 and the adjustment wheel 2. Smooth rotation can be continued without causing displacement.

FIG. 5 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In this example, FIG. As shown, the concave curved surface 11A has an arc having a radius R on both sides of the bottom 12 and a flat portion 1 tangent to the arc outside the arc.
3 and 13 are formed, that is, the width W sandwiching the bottom 12
Is an arc, and both sides are flat portions 13,13. Also in this example, when the work 111 is not in contact with the grinding wheel 1 and the adjustment wheel 2, the work 111 rotates while sliding on the concave curved surface 11 </ b> A, so that the rotation can be performed smoothly and the bottom 12.
By this, the work center grinding height H is maintained, and the work 111 can be rotated without the center position S of the work 111 being displaced between the grinding wheel 1 and the adjustment wheel 2, whereby the arc-shaped grinding surface 114 grinding can be performed well.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
Although the embodiment has been described using a work having two non-ground surfaces, the number of non-ground surfaces may be one or three or more. The concave curved surface may be curved, and may be, for example, a curved surface composed of a part of an ellipse.

[0022]

According to the centerless grinding method of the first aspect of the present invention, the support has a concave curved surface larger than the curvature of the arc-shaped grinding surface, and the work is in a non-contact position with the grinding wheel and the adjusting wheel. A grinding method in which the arc-shaped ground surface is slidably supported on the concave curved surface to rotate the work, and when grinding a work having an arc-shaped ground surface and a non-ground surface that is cut out on the outer periphery, a conventional method is used. It is possible to provide a centerless grinding method that can eliminate the need for complicated work before and after grinding and improve the working efficiency.

In the centerless grinding machine according to a second aspect of the present invention, the work has an arcuate ground surface and a non-ground surface on the outer periphery, and the support surface of the support has a concave curvature larger than the curvature of the arcuate ground surface. And the width of the concave curved surface is formed to be smaller than twice the radius of the arcuate ground surface, and the workpiece has an arcuate ground surface and a notched non-ground surface on the outer periphery. In grinding, a centerless grinding machine can be provided which eliminates the need for conventional complicated work before and after grinding and can improve work efficiency.

According to a third aspect of the present invention, in the centerless grinding machine according to the second aspect of the present invention, the work has the non-grinding surface at a position facing the flat surface and is flat. At the position where the surface faces the grinding wheel and the adjusting wheel, the work comes into non-contact with the grinding wheel and the adjusting wheel, and in this state, the arc-shaped grinding surface slides on the concave curved surface of the support and is supported again. It can rotate smoothly to the position supported by the grinding wheel and the adjusting wheel.

The invention of claim 4 is the invention of claim 2 or 3
In the centerless grinding machine according to the invention, the position of the bottom of the concave curved surface is set immediately below the center position of the workpiece in the grinding state, and in addition, the rotation center of the workpiece is located between the grinding wheel and the adjustment wheel. Smooth rotation can be continued without causing displacement.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a centerless grinding machine showing a first embodiment of the present invention.

FIG. 2 is a front view of a support and a workpiece according to the first embodiment;

FIG. 3 is a front view showing a state in which a work is sandwiched and supported by a grinding wheel and an adjustment wheel.

FIG. 4 is a front view showing a state in which the work is supported by the support while sliding and rotating.

FIG. 5 is a front view of a support showing a second embodiment of the present invention.

FIG. 6 is a schematic front view of a conventional centerless grinding machine.

FIG. 7 is a schematic plan view of the same.

FIG. 8 is a front view of a work.

FIG. 9 is a side view of a work.

FIG. 10 is a perspective view showing a state in which the workpieces are overlapped and adhered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinding wheel 2 Adjusting wheel 3 Blade (support) 11 Concave curved surface (support surface) 12 Bottom W Width S Center position

Claims (4)

[Claims] 1. A grinding wheel rotatably provided, an adjusting wheel substantially parallel to the grinding wheel and rotatably provided, and an adjusting wheel provided between the grinding wheel and the adjusting wheel. A centerless grinding method for grinding the arc-shaped ground surface of the work having an arc-shaped ground surface and a non-ground surface on an outer periphery by using a support that supports a work that moves while being ground between a car and a vehicle. A concave curved surface that is larger than the curvature of the arc-shaped ground surface is provided on the support, and the arc-shaped ground surface is slidably supported on the concave curved surface when the workpiece is not in contact with the grinding wheel and the adjustment wheel. A centerless grinding method wherein the workpiece rotates. 2. A grinding wheel rotatably provided, an adjusting wheel substantially parallel to the grinding wheel and rotatably provided, and an adjusting wheel provided between the grinding wheel and the adjusting wheel. A centerless grinding machine having a support having a support surface for supporting a workpiece moving while being ground between a car, wherein the workpiece has an arc-shaped ground surface and a non-ground surface on its outer periphery, A centerless grinding machine characterized in that the supporting surface is formed as a concave curved surface larger than the curvature of the arc-shaped ground surface, and the width of the concave curved surface is formed smaller than twice the radius of the arc-shaped ground surface. . 3. The centerless grinding machine according to claim 1, wherein the work has the non-ground surface at a position facing the non-ground surface and is flat. 4. The centerless grinding machine according to claim 2, wherein a position of a bottom of the concave curved surface is set immediately below a center position of the workpiece in a grinding state.